CVE-2022-49762: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: ntfs: check overflow when iterating ATTR_RECORDs Kernel iterates over ATTR_RECORDs in mft record in ntfs_attr_find(). Because the ATTR_RECORDs are next to each other, kernel can get the next ATTR_RECORD from end address of current ATTR_RECORD, through current ATTR_RECORD length field. The problem is that during iteration, when kernel calculates the end address of current ATTR_RECORD, kernel may trigger an integer overflow bug in executing `a = (ATTR_RECORD*)((u8*)a + le32_to_cpu(a->length))`. This may wrap, leading to a forever iteration on 32bit systems. This patch solves it by adding some checks on calculating end address of current ATTR_RECORD during iteration.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 4.9.334
linux	linux_kernel	4.10 — 4.14.300
linux	linux_kernel	4.15 — 4.19.267
linux	linux_kernel	4.20 — 5.4.225
linux	linux_kernel	5.5 — 5.10.156
linux	linux_kernel	5.11 — 5.15.80
linux	linux_kernel	5.16 — 6.0.10

References

Advisories & Patches

https://git.kernel.org/stable/c/45683723f6b53e39e8a4cec0894e61fd6ec71989 https://git.kernel.org/stable/c/5559eb5809353a83a40a1e4e7f066431c7b83020 https://git.kernel.org/stable/c/63095f4f3af59322bea984a6ae44337439348fe0 https://git.kernel.org/stable/c/785b2af9654b8beac55644e36da0085c5d776361 https://git.kernel.org/stable/c/86f36de14dce5802856bb7a5921d74439db00b64 https://git.kernel.org/stable/c/957732a09c3828267c2819d31c425aa793dd475b https://git.kernel.org/stable/c/b612f924f296408d7d02fb4cd01218afd4ed7184 https://git.kernel.org/stable/c/b63ddb3ba61e2d3539f87e095c881e552bc45dab

Frequently Asked Questions

What is CVE-2022-49762? +

In the Linux kernel, the following vulnerability has been resolved: ntfs: check overflow when iterating ATTR_RECORDs Kernel iterates over ATTR_RECORDs in mft record in ntfs_attr_find(). Because the ATTR_RECORDs are next to each other, kernel can get the next ATTR_RECORD from end address of current ATTR_RECORD, through current ATTR_RECORD length field. The problem is that during iteration, when kernel calculates the end address of current ATTR_RECORD, kernel may trigger an integer overflow bug in executing `a = (ATTR_RECORD*)((u8*)a + le32_to_cpu(a->length))`. This may wrap, leading to a forever iteration on 32bit systems. This patch solves it by adding some checks on calculating end address of current ATTR_RECORD during iteration. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-49762? +

CVE-2022-49762 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2022-49762? +

CVE-2022-49762 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-49762? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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